Fuel-supply system.



W. L. MARR.

' FUEL 'SUPPLYSYSTEM. APPLIQATION FILED SEPT-26, 1914.

" Patented Aug. 14';

- 2 SHEETS-SHEET].

IRXMooeo w. L. MARR. FUEL SUPPLY SYSTEM. APPLICATION FILED SEPT. 26. 19M.

Patented Au 14, 1917.

- '2 SHEETSSHEET 2 nn lm:

Wczfier Lmarr,

s WALTER L. MARE, OF FLINT, MICHIGAN.

FUEL-SUPPLY SYSTEM.

Specification of Letters Patent.

Patented Auga-Jl't, 1917.

Application filed September 26, 1914. Serial No. 863,714.

To all whom, it may concern.-

Be .it known that I, lVALTnn L. Mann,

a citizen of the United States of America,

boats.;aeroplanes and the like in which the power plant is dependent upon the liquid fuel supply of thecarbureter and in which it is frequently desirable to place the fuel tank or like supply at a point distant from and possibly below the level of the carbureter, it is advisable to provide means for insuring a constant supply of 'fuelto the carburetor or other vaporizing means regardless of the relative positions of thevcarbureter and tank to the tilting of the vehicle or boat in which they are mounted, and without regard also to'the engine speed, i

This invention relates to a fuel supply sys tom for gas engines arranged to insure a positive feed of liquid fuel to the vaporizing means without regard 'toitheposition of the mainfuelsupply'receptaclei relative to such vaporizer. Y i

The invention consists in the matters here inafter set forth and more particularly pointed out in-tlie appended claim.

- In the drawings,

Figure 1 is a view in elevation,partlyv broken away showing a fuel supply system that embodies the invention in connection with a gas engine and its vaporizing means; Fig. 2 is a iew in longitudinal section of a supply chamber; and f .Fig. 3 is a View inlongitudinal section of one form of pump;

Referring to the drawings a. main tank l'is shown as disposed below the level of or at a distance from a carburetor 2 or like vaporizer which furnishesfuel for an-eX- plosive engine indicated at 3, the carburetor and engine not forming per soa y part of the invention-and. being of any preferred type.

The supply-chamberA. has a-lower main compartment thatfis connected through a suitable shut off or controlling cock 5 in v the base and a feedpipe 6, with the car bureter 2, the feed pipe having its inner end slightly above the bottom ofthe chamber l preferably in order to trap sediment 1 or water that might collect in the base. An upper compartment that is preferably and conveniently formed in a cap. 7 which hermetically seals the upper end of the chamber has an air opening 9 in communication with an air tube 10. A ball closure 11 orother suitable means seals a discharge opening 12 formed in a depending boss 13 of the cap against back pressurefrom the chamber. into the upper compartment 8, the mouth ofthe duct beyond the closure being preferably formed. as small liquid trap to aid in sealing. A boss 14 on the cap 7' has an inlet 15 to the-upper compartment that is controlled by an outwardly seating closure 16,- preferably a ball, the conformation of the duct forming. a liquid trap for the closure. A pipe 17 connects the duct 15 with the main tank 1 through a suitable fitting 18 the pipe having a continuation 19 that en tendsto within a short distance of the bot- I tom of the reservoir. A return pipe 20 whose inlet is at-a considerable distance above the base of the chamber 4: in the lower c'onipartmentyextends through the base and opens into theupper portion of the main reservoir 1. An air pump-adapted to alternately draw in and expel air from the compartmentS through the pipe 10 is arrangedto be mounted on the'motor and to bedriven therefrom by suitable connections from some moving part. As herein shown in preferred end. i A piston 24 with suitable packing rings 25 and hollow stem 26 recip rocates in the'casing under the action of a cam indicated at 27, or suitable driving connections with the outer end of the stem 26.- A spring 28 acts in oppositionto the cam andisherein shown as maintained in position by an inlet nipple 29 that is in communication with the-pipe 10 through a suitable duct 30 in ,the cylinder head. To avoid back pressure on the outside of the piston a relief passage 31 forms communication between the cylinder outside of the mosphere.

When the pump is set in motion, the infrom the main tank while. the outstroke compresses the-air in the upper compartment of the-chamber and eiects-the contents thereof or a portion of it into the main .lower compartment from whence it passes to the piston and the atformfsuch pump comprises a casing 21 having' an enlarged bore in its outer cylinderport on22 and a head 23 closing the outer stroke. draws fuel through the main pipe carbureter or other vaporizing means. If the fuel is thus forced into the supply chamher faster than it is drawn therefrom by gravity, any excess flows back to the reservoir through the return'pipe, which thus maintains a constant level in the pressure chamber. At the same time the pump eX- erts pressure on the tank contents and on the supply chamber or lower compartments, thus assisting in the feeding toward the vaporizer or carbureter. Thus regardless of the relative position of the tank and the vaporizing means there is a constant supply to the vaporizer and by making the pump of proper capacity, the engine even at low speeds always maintains through the agency of the pump a suii'icient supply of fuel to insureproper delivery of the desired fuel charge to the engine.

Obviously changes in the details of construction may be made withoutdeparting from the spirit of my invention and I do not care to limit myself to any particular form or arrangement of parts. What I claim is Apump adapted for a fuel feed supplysystem, of an explosive engine adapted to be constantly and simultaneously mechanically operated with and by the engine to receive fuel and discharge the same comprising" in combination with a cam shaft; a pump casing adapted for attachment to an engine in proximity to the cam shaft, a cylinder portion carried thereby, a ported head carried by' circling said nipple within said tubular stem and holding said stem in position to be actuated by said cam shaft.

In testimony whereofj'l afiiX my signature in presence of two witnesses.

WALTER L lVir'iRR.v /Vitnesses:

L. Nansen, F. A. ALLEN. 

